Extract eventfilter declarations to sys/_eventfilter.h

This allows replacing "sys/eventfilter.h" includes with "sys/_eventfilter.h"
in other header files (e.g., sys/{bus,conf,cpu}.h) and reduces header
pollution substantially.

EVENTHANDLER_DECLARE and EVENTHANDLER_LIST_DECLAREs were moved out of .c
files into appropriate headers (e.g., sys/proc.h, powernv/opal.h).

As a side effect of reduced header pollution, many .c files and headers no
longer contain needed definitions.  The remainder of the patch addresses
adding appropriate includes to fix those files.

LOCK_DEBUG and LOCK_FILE_LINE_ARG are moved to sys/_lock.h, as required by
sys/mutex.h since r326106 (but silently protected by header pollution prior
to this change).

No functional change (intended).  Of course, any out of tree modules that
relied on header pollution for sys/eventhandler.h, sys/lock.h, or
sys/mutex.h inclusion need to be fixed.  __FreeBSD_version has been bumped.

2 files changed, 6 insertions, 6 deletions

diff --git a/sys/dev/firewire/firewire.c b/sys/dev/firewire/firewire.c
index 3798188fdcb1..5e8cb3b83273 100644
--- a/sys/dev/firewire/firewire.c
+++ b/sys/dev/firewire/firewire.c
@@ -38,16 +38,15 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/types.h>
-
+#include <sys/conf.h>
+#include <sys/eventhandler.h>
 #include <sys/jail.h>
 #include <sys/kernel.h>
-#include <sys/module.h>
+#include <sys/kthread.h>
 #include <sys/malloc.h>
-#include <sys/conf.h>
+#include <sys/module.h>
 #include <sys/sysctl.h>
-#include <sys/kthread.h>
+#include <sys/systm.h>
 
 #include <sys/kdb.h>
 #include <sys/bus.h>		/* used by smbus and newbus */
diff --git a/sys/dev/firewire/fwohci.c b/sys/dev/firewire/fwohci.c
index 03df023b7531..30eca83900e7 100644
--- a/sys/dev/firewire/fwohci.c
+++ b/sys/dev/firewire/fwohci.c
@@ -39,6 +39,7 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/lock.h>
 #include <sys/mbuf.h>
 #include <sys/malloc.h>
 #include <sys/sockio.h>